Summary of Significant Accounting Policies - Properties (Details)	Jun. 30, 2019 unit
Property Plant And Equipment [Line Items]
Number of Units	1,360
RRE Payne Place Holdings, LLC
Property Plant And Equipment [Line Items]
Number of Units	11
RRE Bay Club Holdings, LLC
Property Plant And Equipment [Line Items]
Number of Units	220
RRE Tramore Village Holdings, LLC
Property Plant And Equipment [Line Items]
Number of Units	324
RRE Matthews Reserve Holdings, LLC
Property Plant And Equipment [Line Items]
Number of Units	212
RRE Kensington Holdings, LLC
Property Plant And Equipment [Line Items]
Number of Units	204
RRE Wimbledon Oaks Holdings, LLC
Property Plant And Equipment [Line Items]
Number of Units	248
RRE Summit Holdings, LLC
Property Plant And Equipment [Line Items]
Number of Units	141